mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-26 06:11:37 +00:00
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/*
|
|
** File: prrwlock.h
|
|
** Description: API to basic reader-writer lock functions of NSPR.
|
|
**
|
|
**/
|
|
|
|
#ifndef prrwlock_h___
|
|
#define prrwlock_h___
|
|
|
|
#include "prtypes.h"
|
|
|
|
PR_BEGIN_EXTERN_C
|
|
|
|
/*
|
|
* PRRWLock --
|
|
*
|
|
* The reader writer lock, PRRWLock, is an opaque object to the clients
|
|
* of NSPR. All routines operate on a pointer to this opaque entity.
|
|
*/
|
|
|
|
|
|
typedef struct PRRWLock PRRWLock;
|
|
|
|
#define PR_RWLOCK_RANK_NONE 0
|
|
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_NewRWLock
|
|
** DESCRIPTION:
|
|
** Returns a pointer to a newly created reader-writer lock object.
|
|
** INPUTS: Lock rank
|
|
** Lock name
|
|
** OUTPUTS: void
|
|
** RETURN: PRRWLock*
|
|
** If the lock cannot be created because of resource constraints, NULL
|
|
** is returned.
|
|
**
|
|
***********************************************************************/
|
|
NSPR_API(PRRWLock*) PR_NewRWLock(PRUint32 lock_rank, const char *lock_name);
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_DestroyRWLock
|
|
** DESCRIPTION:
|
|
** Destroys a given RW lock object.
|
|
** INPUTS: PRRWLock *lock - Lock to be freed.
|
|
** OUTPUTS: void
|
|
** RETURN: None
|
|
***********************************************************************/
|
|
NSPR_API(void) PR_DestroyRWLock(PRRWLock *lock);
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_RWLock_Rlock
|
|
** DESCRIPTION:
|
|
** Apply a read lock (non-exclusive) on a RWLock
|
|
** INPUTS: PRRWLock *lock - Lock to be read-locked.
|
|
** OUTPUTS: void
|
|
** RETURN: None
|
|
***********************************************************************/
|
|
NSPR_API(void) PR_RWLock_Rlock(PRRWLock *lock);
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_RWLock_Wlock
|
|
** DESCRIPTION:
|
|
** Apply a write lock (exclusive) on a RWLock
|
|
** INPUTS: PRRWLock *lock - Lock to write-locked.
|
|
** OUTPUTS: void
|
|
** RETURN: None
|
|
***********************************************************************/
|
|
NSPR_API(void) PR_RWLock_Wlock(PRRWLock *lock);
|
|
|
|
/***********************************************************************
|
|
** FUNCTION: PR_RWLock_Unlock
|
|
** DESCRIPTION:
|
|
** Release a RW lock. Unlocking an unlocked lock has undefined results.
|
|
** INPUTS: PRRWLock *lock - Lock to unlocked.
|
|
** OUTPUTS: void
|
|
** RETURN: void
|
|
***********************************************************************/
|
|
NSPR_API(void) PR_RWLock_Unlock(PRRWLock *lock);
|
|
|
|
PR_END_EXTERN_C
|
|
|
|
#endif /* prrwlock_h___ */
|